Time reversal may refer to:
- In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — i.e. where a mirror (reverse) transformation is applied to a forward direction time state.
- Time Reversal Signal Processing, a signal processing technique popular in acoustics, and currently being applied to electromagnetics, that results from the reversal in time of a system's response signal
- Time travel, theorised and speculative concepts about travelling physically through time
Famous quotes containing the words time and/or reversal:
“All neighbourly content and easy talk are gone,
But there’s no good complaining, for money’s rant is on,
He that’s mounting up must on his neighbour mount
And we and all the Muses are things of no account.
They have schooling of their own but I pass their schooling by,
What can they know that we know that know the time to die?”
—William Butler Yeats (1865–1939)
“Perversity depends on reversal and substitution.”
—Mason Cooley (b. 1927)